# -*- coding: UTF-8 -*-
"""
@author: tgy
@file: demo01.py
@time: 2021/05/16
"""
import sys


def test():
    ...
    name = 'zhangsan'
    n1 = name
    print(sys.getrefcount(name))
    del n1
    print(sys.getrefcount(name))

    print('111'.center(50, '#'))
    print('111'.zfill(20))

if __name__ == '__main__':
    pass
    test()